With dollar signs in their eyes, a growing number of mutual funds are taking a stab at private equity investments. The obvious reason is the level of returns: Last year, private equity funds returned 27%, according to Cambridge Associates, which tracks them, compared with the 5% for the Standard & Poor’s 500 Index. Mutual funds, however, may be entering a mine field, according to The Wall Street Journal, as they are required the assess the value of their holdings daily. Failure to do so can get mutual funds into trouble, and into even bigger trouble if they undervalue their holdings. In fact, a number of firms have been slapped with sanctions for mispricing. Then, there’s problem of finding a buyer when the time comes, something mutual funds are not accustomed to.